<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Feed_Reader
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Entry.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Feed_Reader
 */
require_once 'Zend/Feed/Reader.php';

/**
 * @see Zend_Feed_Reader_Extension_EntryAbstract
 */
require_once 'Zend/Feed/Reader/Extension/EntryAbstract.php';

/**
 * @category   Zend
 * @package    Zend_Feed_Reader
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Feed_Reader_Extension_WellFormedWeb_Entry extends Zend_Feed_Reader_Extension_EntryAbstract {
	/**
	 * Get the entry comment Uri
	 *
	 * @return string|null
	 */
	public function getCommentFeedLink() {
		$name = 'commentRss';
		if (array_key_exists ( $name, $this->_data )) {
			return $this->_data [$name];
		}
		
		$data = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/wfw:' . $name . ')' );
		
		if (! $data) {
			$data = null;
		}
		
		$this->_data [$name] = $data;
		
		return $data;
	}
	
	/**
	 * Register Slash namespaces
	 *
	 * @return void
	 */
	protected function _registerNamespaces() {
		$this->_xpath->registerNamespace ( 'wfw', 'http://wellformedweb.org/CommentAPI/' );
	}
}
